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<!--bootstrap-->
<!--展示图片-->
<img alt="这是一个美女图片" class="img-rounded" src="./img/a.jpg" title="这是美女" width="450">
<img alt="这是一个美女图片" class="img-circle" src="./img/a.jpg" title="这是美女" width="450">
<img alt="这是一个美女图片" class="img-thumbnail" src="./img/a.jpg" title="这是美女" width="450">


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